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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>09.less的使用</title>
    <link rel="stylesheet/less" href="css/a.less">
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<body>
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    <!-- less 编译器 将less语言编译成css 并由浏览器解析 -->
    <script src="https://cdn.jsdelivr.net/npm/less"></script>
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